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Long - Term Debt and Bank Facility Borrowings (Details Textual) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended
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Jun. 30, 2012 | Sep. 30, 2011 | Jul. 31, 2011 | Nov. 30, 2011 First Amendment [Member] | Jun. 30, 2012 First Amendment [Member] | Apr. 30, 2012 Second Amendment [Member] | Jun. 30, 2012 8.875% Senior Notes [Member] | Dec. 31, 2011 8.875% Senior Notes [Member] | Jun. 30, 2012 8.875% Senior Notes [Member] | Jun. 30, 2012 Senior Notes [Member]
Long-Term Debt and Bank Facility Borrowings (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Maturity of public notes due |  |  |  |  |  |  |  |  | 2017-12 |
Interest accrued by public notes for each year |  |  |  |  |  |  | 8.875% | 8.875% |  |
Discount on notes |  |  |  |  |  |  | $ 0.7 |  | $ 0.7 |
Maximum debt allowed for acquisitions |  |  |  |  |  |  |  |  | 100 |
Maximum borrowing capacity under revolving credit facility |  |  |  |  | 250 |  |  |  |  |
Increase in credit facility |  |  |  | 50 |  |  |  |  |  |
Maximum borrowing capacity under revolving credit facility |  |  |  |  | 350 |  |  |  |  |
Facility size that can be increased without consulting bank group |  |  |  |  | 100 |  |  |  |  |
Description of Variable Rate |  |  |  |  | Interest rate is LIBOR plus (i) 1.75% (if Availability, as defined in the revolving credit facility agreement is greater than or equal to $150 million), or (ii) 2.00% (if Availability is greater than $75 million but less than $150 million), or (iii) 2.25% (if Availability is less than or equal to $75 million). The commitment fee on the unused portion of the facility is 0.375% per annum |  |  |  |  |
Debt instrument basis of spread percentage one |  |  |  |  | 1.75% |  |  |  |  |
Debt instrument basis of spread percentage two |  |  |  |  | 2.00% |  |  |  |  |
Debt instrument basis of spread percentage three |  |  |  |  | 2.25% |  |  |  |  |
Minimum revolving credit facility agreement one |  |  |  |  | 150 |  |  |  |  |
Maximum revolving credit facility agreement two |  |  |  |  | 150 |  |  |  |  |
Minimum revolving credit facility agreement two |  |  |  |  | 75 |  |  |  |  |
Minimum revolving credit facility agreement three |  |  |  |  | 75 |  |  |  |  |
Commitment fee on the unused portion of the facility |  |  |  |  | 0.375% |  |  |  |  |
Availability |  |  |  |  | 43.8 |  |  |  |  |
Availability percentage to maximum facility size |  |  |  |  | 12.50% |  |  |  |  |
Minimum fixed charge coverage ratio |  |  |  |  | 1.1 |  |  |  |  |
Availability required to make acquisition |  |  |  |  | 40 |  |  |  |  |
Availability required to pay distributions or repurchase common units |  |  |  |  | 61.3 |  |  |  |  |
Percentage of the maximum facility size on a historical pro forma and forward-looking basis |  |  |  |  | 17.50% |  |  |  |  |
Minimum fixed charge coverage ratio for distributions to unitholders |  |  |  |  | 1.15 |  |  |  |  |
Availability required to pay distributions for the period April 1, 2012 to December 31, 2012 |  |  |  |  |  | 50.0 |  |  |  |
Maximum payment of distributions per common unit for the period April 1, 2012 to December 31, 2012 |  |  |  |  |  | 0.2325 |  |  |  |
Borrowing base for fixed assets and customer lists before amendment |  |  |  |  |  | 50.0 |  |  |  |
Borrowing base for fixed assets and customer lists |  |  |  |  |  | 60.0 |  |  |  |
Amount of additional subordinated debt |  |  |  |  |  | 25.0 |  |  |  |
Senior notes issuance date |  |  |  |  |  |  |  |  |  | November 2010
Maximum investment in an unrestricted subsidiary before amendment |  |  |  |  |  | 10.0 |  |  |  |
Maximum investment in unrestricted subsidiary |  |  |  |  |  | 20.0 |  |  |  |
Long-Term Debt and Bank Facility Borrowings (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Restricted payments without passing certain financial tests | 22.0 |  |  |  |  |  |  |  |  |
Revolving credit facility expiry | 2016-06 |  |  |  |  |  |  |  |  |
Amount outstanding under the revolving credit facility | 0 | 0 |  |  |  |  |  |  |  |
Letters of credit issued | 46.9 | 46.7 |  |  |  |  |  |  |  |
Availability in compliance with the fixed charge coverage ratio | 154.0 | 162.4 |  |  |  |  |  |  |  |
Available sale of offerings of common units under shelf registration | $ 0 |  | $ 250 |  |  |  |  |  |  |

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